[metalliqaz]

Or even print("STRING", var, "STRING")

keep in mind that for long strings, each `+` creates a new string object (at least, it did in the 2.x days and I assume it hasn't changed)

[zahlman]

It has indeed not changed. But practically speaking it doesn't matter much. The string implementation cheats by using resizable buffers internally for at least some purposes, while presenting an immutable-type interface. But regardless, a given line of code is going to have O(1) such additions; it's not remotely as bad as `for i in items: str += foo(i)`. (This should be done using `''.join` instead.)

[TZubiri]

#Takes around 1 second s="a"*3000000000

#instant, does not consume twice as much memory. s+="a"

I don't know the internals, but certainly there's not a new string being created. Maybe if it exceeds capacity? Who cares at that point, it's python strings, not Matmuls in C.